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HALLETT FAN

10-03-2020 05:44 PM

MEFI 3 IAC Troubleshoot

Does anybody have a trouble-shooting diagram for diagnosing a non functioning IAC motor ? System is MEFI 3 , on a 565ci with Whipple 3.3 . I have scan tool , no code . No movment when command by scan tool . trio of fuses OK . Tried different IAC IAC motor is typical GM 4 pin

sutphen 30

10-04-2020 09:39 AM

heres a pin out of the ecu,,my guess,driver circuit has been damaged in the ecu.but,hoping its a broken wire
https://cimg4.ibsrv.net/gimg/www.off...89d91ad54f.jpg

HALLETT FAN

10-06-2020 02:20 PM

Thanks , that'll get me started !

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